Mechanisms of developmental change in infant categorization

Computational models are tools for testing mechanistic theories of learning and development. Formal models allow us to instantiate theories of cognitive development in computer simulations. Model behavior can then be compared to real performance. Connectionist models, loosely based on neural information processing, have been successful in capturing a range of developmental phenomena, in particular on-line within-task category learning by young infants. Here we describe two new models. One demonstrates how age dependent changes in neural receptive field sizes can explain observed changes in on-line category learning between 3 and 10 months of age. The other aims to reconcile two conflicting views of infant categorization by focusing on the different task requirements of preferential looking and manual exploration studies. A dual-memory hypothesis posits that within-task category learning that drives looking time behaviors is based on a fast-learning memory system, whereas categorization based on background experience and assessed by paradigms requiring complex motor behavior relies on a second, slow-learning system. The models demonstrate how emphasizing the mechanistic causes of behaviors leads to discovery of deeper, more explanatory accounts of learning and development.     

Learning to infer the time of our actions and decisions from their consequences

Research shows that people infer the time of their actions and decisions from their consequences. We asked how people know how much time to subtract from consequences in order to infer their actions and decisions. They could either subtract a fixed, default, time from consequences, or learn from experience how much time to subtract in each situation. In two experiments, participants’ actions were followed by a tone, which was presented either immediately or after a delay. In Experiment 1, participants estimated the time of their actions; in Experiment 2, the time of their decisions to act. Both actions and decisions were judged to occur sooner or later as a function of whether consequences were immediate or delayed. Estimations tended to be shifted toward their consequences, but in some cases they were shifted away from them. Most importantly, in all cases participants learned progressively to adjust their estimations with experience.     

大学生内隐职业偏见和内隐职业性别刻板印象研究

本研究采用内隐联想测验和相应的外显报告考察了大学生被试在职业偏见和职业性别刻板印象中的态度。结果表明,被试的内隐和外显态度出现了分离,大学生中普遍存在着内隐职业偏见和职业性别刻板印象。该研究再次证明了内隐联想测验是一种有效的测量内隐态度的方法。     

RELIGION AND FRANCIS BACON'S SCIENTIFIC UTOPIANISM

Francis Bacon often is depicted as a patriarch of modernity who promotes human rational action over faith in divine Providence and as a secular humanitarian who realized that improvement of the human condition depended on human action and not on God's saving acts in history. Bacon's New Atlantis is usually described as a “scientific utopia” because its ideal order, harmony, and prosperity are the result of the investigations of nature conducted by the members of Solomon's House. I challenge these characterizations by showing that Bacon's so‐called scientific utopianism is grounded in his religious convictions that his age was one of Providential intervention and that he was God's agent for an apocalyptic transformation of the human condition. I examine the centrality of these religious themes in two of his philosophical works, The Advancement of Learning and The Great Instauration, which are well known for setting out Bacon's critique of the state of learning and for presenting the principles of his epistemology. Analysis of The Advancement of Learning demonstrates Bacon's conviction that his reform of natural philosophy was part of a Providentially guided, twofold restoration of the knowledge of nature and the knowledge of God. Examination of The Great Instauration reveals that Bacon sees his age as one of apocalyptic transformation of the human condition that restores humanity to a prelapsarian state. Analysis of the New Atlantis shows that utopian perfection can be achieved only through a combination of right religion and the proper study of nature. Moreover, when the “scientific” work of Solomon's House is recontextualized within the religious themes of salvation and deliverance that permeate the New Atlantis, the full scope of Bacon's “scientific utopianism” can be seen, and this project is not the one usually portrayed in scholarly treatments. Bacon's program for rehabilitating humanity and its relation to nature is not a secular, scientific advance through which humanity gains dominion over nature and mastery of its own destiny but rather one guided by divine Providence and achieved through pious human effort.     

Associative learning performance is impaired in zebrafish (Danio rerio) by the NMDA-R antagonist MK-801

The zebrafish is gaining popularity in behavioral neuroscience perhaps because of a promise of efficient large scale mutagenesis and drug screens that could identify a substantial number of yet undiscovered molecular players involved in complex traits. Learning and memory are complex functions of the brain and the analysis of their mechanisms may benefit from such large scale zebrafish screens. One bottleneck in this research is the paucity of appropriate behavioral screening paradigms, which may be due to the relatively uncharacterized nature of the behavior of this species. Here we show that zebrafish exhibit good learning performance in a task adapted from the mammalian literature, a plus maze in which zebrafish are required to associate a neutral visual stimulus with the presence of conspecifics, the rewarding unconditioned stimulus. Furthermore, we show that MK-801, a non-competitive NMDA-R antagonist, impairs memory performance in this maze when administered right after training or just before recall but not when given before training at a dose that does not impair motor function, perception or motivation. These results suggest that the plus maze associative learning paradigm has face and construct validity and that zebrafish may become an appropriate and translationally relevant study species for the analysis of the mechanisms of vertebrate, including mammalian, learning and memory.     

初中生生活事件、心理韧性与学习倦怠的关系

目的:探讨初中生的学习倦怠、生活事件和心理韧性的关系。方法:从济宁市四所初级中学抽取465名初中生,以青少年生活事件量表、青少年心理韧性量表、中学生学习倦怠问卷为研究工具,对初中生进行测查。结果:初中生的学习倦怠水平随年级增长呈逐渐升高趋势;男生的学习倦怠水平显著高于女生;心理韧性作为中介变量,影响到生活事件与学习倦怠之间的关系,中介效应占总效应的比例为42.4%。结论:培养学生的心理韧性可以有助于降低他们的学习倦怠水平。